微信小程序map视野发生改变时切换定位点

<!--地图-->
<view>
  <map id="myMap" style="width: 100%; height: 300px;" 
    latitude="{{latitude}}" longitude="{{longitude}}"
    scale="{{scale}}" markers="{{markers}}" controls="{{controls}}" 
    bindmarkertap="markertap" show-location="{{true}}" 
    bindregionchange="regionchange">
  </map>
</view>
<view class="xzwzxx">
  <view class="zcwzbt">您选中的位置：</view>
  <view class="xzwz">{{address}}</view>
</view>
<scroll-view scroll-top="{{scrollTop}}" scroll-y="true" class="dwlist">
  <view class="mapList">
    <block wx:for="{{markersList}}">
      <view class="{{index== iconSY ? 'dianweiList xzico' :'dianweiList'}}" bindtap='XZlist' data-rem="{{item}}"
        data-sy="{{index}}">
        <view class="mark_img">
          <image src="../../images/blue_location.png" class="DWimg"></image>
        </view>
        <view class="dwxq">
          <view>{{item.name}}</view>
          <view>{{item.address}}</view>
        </view>
      </view>
    </block>

  </view>
</scroll-view>
<view class="qrxd">
  <button class="qdbutton" bindtap="rqxd">确认选点</button>
</view>

css

.map_container{width:100%;overflow:hidden;height: 50vh; width: 100%;}
.map{width:100%;height:100%}
.mapList{background:#fff;padding:2.5%;}
.dianweiList{ min-height: 80rpx; display: flex; align-items: center; margin-bottom: 15rpx;}
.mark_img{ width: 60rpx; text-align: center;}
.DWimg{ width:32rpx; height: 42rpx;}
.dwxq{ border-bottom: 1px #f0f1f3 solid; min-height: 80rpx; width: 100%; padding-bottom: 10rpx;}
.xzico{ color: #3370ff;}
.xzwzxx{padding-bottom: 20rpx; width: 95%; margin: 0 auto;}
.zcwzbt{ color: #333; font-weight: 600; line-height: 60rpx;}
.xzwz{ color: #666;}
.dwlist{ height: 30vh;}
.qrxd{ position: fixed; bottom: 0px;height:80rpx; background: #fff; z-index: 100; width: 100%;}
.qdbutton{border:0px;height: 70rpx; line-height:70rpx;border-radius: 70rpx;  background: #4c8cee;width:500rpx;color: #fff; font-size: 24rpx;}
.qdbutton::after{border: 0px !important;}

js

 var amapFile = require('../../utils/amap-wx.130');
 var key = "4f56f0e40338315d0f383f17637f5896";
 var markersData = [];
 var myAmapFun = new amapFile.AMapWX({
   key: key
 });
 Page({
   data: {
     latitude: 38.02604953342014, // 初始纬度
     longitude: 114.39047607421875, // 初始经度
     scale: 16, // 初始缩放级别
     markers: [{
       id: 0,
       latitude: 38.02604953342014,
       longitude: 114.39047607421875,
       width: 20,
       height: 30
     }], // 标记点
     controls: [], // 地图控件
   },

   onLoad: function (options) {
     var that = this;
     //获取当前位置  
     this.setData({
      //  latitude: options.lat,
      //  longitude: options.lon,
      latitude: 38.02604953342014,
      longitude: 114.39047607421875,
     });
     that.showMap(that.data.longitude, that.data.latitude);
   },
   //显示地图
   showMap: function (longitude, latitude) {
     var that = this;
     let markers = [{
       id: 0,
       latitude: latitude,
       longitude: longitude,
       width: 20,
       height: 30
     }]
     this.setData({
       markers: markers,
     });
     var location = `${longitude},${latitude}`   
     myAmapFun.getRegeo({
       //如果经纬度有问题会导致不进入回调方法，从而报错
       location: location,
       success: function (e) {
         let csdz = e[0].regeocodeData.addressComponent
         let shencz = csdz.province + csdz.city + csdz.district
         //成功回调
         that.setData({
           address: e[0].name, //详细地址,
           markersList: e[0].regeocodeData.pois,
           shenName: shencz
         });
       },
       fail: function (info) {
         //失败回调
         console.log(info)
       }
     })
   },

   markertap: function (e) {
     // 标记点被点击时触发的事件
     console.log(e.markerId);
   },
   regionchange: function (e) {
     let that = this
     console.log(e)
     if (e.causedBy == 'drag') {
       let nmarkers = [{
         id: 1001,
         latitude: e.detail.centerLocation.latitude,
         longitude: e.detail.centerLocation.longitude,
         width: 20,
         height: 30
       }]
       that.setData({
         latitude: e.detail.centerLocation.latitude,
         longitude: e.detail.centerLocation.longitude,
         markers: nmarkers,
       })
       //解析经纬度
       that.location = `${e.detail.centerLocation.longitude},${e.detail.centerLocation.latitude}`
       myAmapFun.getRegeo({
         //如果经纬度有问题会导致不进入回调方法，从而报错
         location: that.location,
         success: function (e) {
           console.log(e[0])
           that.setData({
             address: e[0].regeocodeData.formatted_address, //详细地址,           
             iconSY: null,
             markersList: e[0].regeocodeData.pois
           });
         },
         fail: function (info) {
           //失败回调
           console.log(info)
         }
       })
     }
   }
 })